Hello I have a 2002 Dodge Dakota SLT 4.7L. It has a no bus at the odometer display. None of the gauges work but the truck starts and runs and drives. I hooked a diagnostic tool and could only see the RPM and Throttle position value. I connected to 2 separate tools both same thing. I disconnected airbag module, ABS module, transmission module, transfer case module, and disconnected the cluster and monitored connection no change. Voltage at pin 2 of DTC is between .5 and .9. I don’t have an oscilloscope. I can hook the cluster to the truck with it on and gauges will raise and then not function. When gauges are installed they will not move when ignition is turned on. Just warning lights come on and odometer blinks then no bus. I did self check on cluster and got 920 921 and 999. I pulled the connector for the fire wall and various module to inspect nothing crazy. I am thinking harness grounded some were or bad cluster. Just looking for a way to verify before I buy the parts. I pulled the junction connection and the look good but I don’t have a schematic to verify PCI BUS. What else can I do to verify problem? Truck runs and drives no gauges.

 

Start disconnecting sensors that are on the 5 volt bus. (O2 sensor, throttle position, MAP, etc.) Test after you disconnect each one, see if anything changes.